OEM Carrier 1-Pole Contactor 25A 24V Coil for Model PH1PNB024000AAAA

This is the OEM factory-replacement contactor for the Carrier PH1PNB024000AAAA residential heat pump system. Part number HN51KB024, this single-pole contactor is the high-voltage relay that completes the circuit to your compressor and condenser fan motor every time your thermostat calls for cooling or heating. When the contactor fails — due to pitted contacts, a burned coil, or welded contact points — the unit will either fail to start entirely, run continuously without shutting off, or emit a loud chattering or humming noise from the outdoor cabinet. Replacing a worn contactor is one of the most cost-effective preventive maintenance steps you can perform on any residential heat pump.

• Specs: 1-Pole | 25A Full Load Amps (FLA) | 24V AC Coil (50/60 Hz) | Definite Purpose contactor | Factory OEM part number HN51KB024
• OEM vs Generic: This is a genuine Carrier OEM contactor — manufactured to exact coil resistance, contact gap, and ampacity tolerances. Aftermarket contactors frequently use lighter-gauge contacts that pit and weld faster, shortening equipment life and risking compressor damage.
• Install difficulty: 2/5 — Disconnect all power at the breaker and the disconnect box before opening the access panel. Photograph all wiring before removal. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, multimeter. Verify 24V coil pull-in after installation before closing the panel.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Factory-specified replacement for Carrier model PH1PNB024000AAAA. Always verify the OEM part number on your existing contactor's label and confirm pole count and amperage rating against your unit's wiring diagram before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you buy — contact us today and get your system back up and running fast.